Geovisualization Developer's Guide


When you use this function in a query, it converts the strings of the specified column in the specified dataset to lower case.

For more information on using query functions and operators in a REST API request, see Queries. For an end-to-end description of how to create a query, see Creating a Query.

The codeblock example below transforms first character of the strings in the Region column of the earthquake dataset, whose {DATASET_ID} is 90af668484394fa782cc103409cafe39, to lower case.

  "version": 0.3,
  "dataset": "90af668484394fa782cc103409cafe39",
  "namespace": {
    "to_lower_case": {
      "source": ["Region"],
      "apply": [{
        "fn": "to_lower", 
        "type": "transform",
  "metrics": ["to_lower_case"],

When you submit the above request, the response includes an HTTP status code and a JSON response body.

For more information on the HTTP status codes, see HTTP Status Codes.

For more information on the elements in the JSON structure in the response body, see Query.